Dehydration Property of Shrimp (Pandalus Borealis) Undergoing Heat-Pump Drying Process
92 December, 2009 Int J Agric & Biol Eng Open Access at http://www.ijabe.org Vol. 2 No.4 Dehydration property of Shrimp (Pandalus borealis) undergoing heat-pump drying process Zhang Guochen1, Sigurjón Arason2,3, Sveinn Víkingur Árnason2 (1. Dalian Fisheries University, Heishijiao Street 52, Dalian 116023, China; 2. Icelandic Fisheries Laboratory, P.O.Box 1405, Skulagata 4, 121 Reykjavik, Iceland; 3. Department of Food Science, University of Iceland, Hjarðarhaga 2-6,107 Reykjavík, Iceland) Abstract: Peeled, headed or whole shrimp (Pandalus borealis) was dried in a heat-pump dryer at -2-0℃ and 20℃, respectively, and desorption isotherms characterizing the dehydration property of each shrimp sample group were determined. Desorption isotherms of shrimp handled differently and dried at different temperatures (-2-0℃ or 20℃) aw could be well described by Oswin’s model ( Xa= ()n ). The regression model of peeled, headed or whole shrimp 1- aw was established, which is reliable for predicting the desorption isotherms of shrimp undergoing heat-pump drying. The handling methods of shrimp exhibit measurable influence on desorption isotherms of shrimp, whereas drying temperature (-2-0℃ or 20℃) has little influence on the constants of a and n in Oswin’s model, of whole shrimp, even though it has certain influence on these constants of peeled and headed shrimp. For heat-pump drying, headed shrimp may have a better stability than peeled or whole shrimp due to the best stability. Key words: Heat pump drying, shrimp (Pandalus borealis), dehydration property, desorption isotherm, Oswin’s model DOI: 10.3965/j.issn.1934-6344.2009.04.092-097 Citation: Zhang Guochen, Sigurjón Arason, Sveinn Víkingur Árnason.
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